<template>
    <div class="login_container" :style="backgroundImg">
        <div class="login_box">
            <!-- 头像区域 -->
            <div class="avatar_box">
               <img src="../assets/logo.png" alt=""> 
            </div>
            <!-- 登录表单 -->
            <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
                <el-form-item prop="username" >
                    <el-input v-model="loginForm.username" prefix-icon="el-icon-user-solid"></el-input>
                </el-form-item>
                <el-form-item prop="password">
                    <el-input type="password" v-model="loginForm.password" prefix-icon="el-icon-lock"></el-input>
                </el-form-item>
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="resetloginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
export default {
    data() {
        return {
            loginForm: {
                username: 'admin',
                password: '123456',
            },
            loginFormRules:{
                username: [
                     { required: true, message: '请输入登录名称', trigger: 'blur' },
                     { min: 3, max: 9, message: '长度在 3 到 9 个字符', trigger: 'blur'},
                ],
                password: [
                    { required: true, message: '请输入密码', trigger: 'blur' },
                     { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur'},
                ]
            },
            backgroundImg:{
                backgroundImage: "url("+require("../assets/Earth.jpg")+")",
                backgroundRepeat: "no-repeat",
                backgroundSize: "100% 100%",
            },
        }
    },
    
    methods: {
      resetloginForm() {
          this.$refs.loginFormRef.resetFields();
        },
    
      login() {
          this.$refs.loginFormRef.validate(async valid => {
            if(!valid) return;  
            const { data: res } = await this.$http.post('login', this.loginForm);
            if( res.meta.status !==200 ) return this.$message.error("登录失败! ");
            this.$message.success("登录成功!");

            //token验证
            window.sessionStorage.setItem("token", res.data.token);
            this.$router.push('/home')
          });
    }
}
}
</script>

<style lang="less" scoped>
.login_container {
    
    height: 100%;
}

.login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform:translate(-50%,-50%);
   

    .avatar_box {
        height: 110px;
        width: 110px;
        border: 1px soild #eee;
        border-radius: 50%;
        padding: 8px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left:50%;
        transform: translate(-50%, -50%);
        
        background-color: #fff;
        img {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
}

.login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}

.btns {
    display: flex;
    justify-content: flex-end;  
}
</style>